Union County, SC Shrink-Swell Risk

Union County's SSURGO shrink-swell reading

Low

In Union County, SC, 91.2% of the surveyed soil carries a "Low" shrink-swell rating, 2.17% linear extensibility on average. That's the easiest starting point on this site's scale - a standard foundation is the reasonable default here, though any one lot can still differ.

Before you rely on this for one address

Union County's reading is an average across the whole county, not a promise about any one lot inside it. A site-specific soil report, usually $1,000-$5,000, is what an engineer would actually pull before designing a foundation on a lot in Union County.

Budgeting for Union County, SC

Union County's soil reading points toward standard foundation practice as the likely outcome, not the exception. A geotechnical report runs $1,000-$5,000, typically around $2,700. Foundation repair, if a specific lot turns out to differ from the county average, runs $5,000-$15,000.

Where this sits nationally

Among the 3,085 rated counties on this site, Union County, SC ranks 1,827 most-constrained nationally, and 15 of 46 within South Carolina. Union County covers 514 square miles and counts 26,678 residents.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. St. Joseph County, MI and Greer County, OK are worth a look for comparison.

How this reading is built, and its real limits · Moisture management: the cheap fix that works on any soil

Elsewhere in South Carolina

Every county in South Carolina is on this site, including Barnwell County, SC and Dillon County, SC. The full underlying dataset is downloadable directly, one row per county.